Since your child has sustained head injury
, you need to watch out for a few things.
His level of alertness
Increase in size of the swelling
Inequality of pupils if you can successfully do so
His vitals like pulse, blood pressure and temperature
Since the swelling appears big unlike any previous swelling, it is important to get him hospitalized for 24 to 48 hours.
Equally important is to rule out an underlying skull fracture
by getting an x ray
Since a complete work up is needed , hospitalization is the single best option.